DHS 2022 Grade-3 Technical
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41. Which of the following is also known as ‘common salt’?
Answer: Sodium chloride
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Common salt is sodium chloride (NaCl).
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42. Typhoid fever is a disease caused by
Answer: bacteria
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Typhoid is caused by the bacterium Salmonella Typhi.
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43. Which among the following diseases is not spread by mosquitoes?
Answer: Kala-azar
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Kala-azar is transmitted by infected sand flies, not mosquitoes.
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44. Deficiency in iron causes
Answer: anaemia
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Iron deficiency can cause anaemia due to reduced haemoglobin production.
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45. Deficiency of which hormone leads to diabetes mellitus?
Answer: Insulin
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Insufficient insulin secretion or action leads to diabetes mellitus.
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46. Which of the following is an antibiotic?
Answer: Erythromycin
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Erythromycin is a macrolide antibiotic.
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47. Mitochondria are present in which part of the cell?
Answer: Cytoplasm
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Mitochondria are organelles located in the cytoplasm of eukaryotic cells.
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48. The force acting on unit area of a surface is called
Answer: pressure
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Pressure is force per unit area: P = F/A.
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49. Which of the following is produced by a vibrating diaphragm?
Answer: Sound wave
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A vibrating diaphragm sets the surrounding air into vibration, producing sound waves.
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50. Deficiency in vitamin A causes
Answer: night blindness
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Vitamin A deficiency can impair vision in dim light, causing night blindness.
